f128_to_f16.c File Reference

#include <stdbool.h>
#include <stdint.h>
#include "platform.h"
#include "internals.h"
#include "specialize.h"
#include "softfloat.h"

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Functions
float16_t	f128_to_f16 (float128_t a)

Function Documentation

f128_to_f16()

float16_t f128_to_f16

(

float128_t

a

)

Definition at line 44 of file f128_to_f16.c.

{
    union ui128_f128 uA;
    uint_fast64_t uiA64, uiA0;
    bool sign;
    int_fast32_t exp;
    uint_fast64_t frac64;
    struct commonNaN commonNaN;
    uint_fast16_t uiZ, frac16;
    union ui16_f16 uZ;
 
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    uA.f = a;
    uiA64 = uA.ui.v64;
    uiA0  = uA.ui.v0;
    sign  = signF128UI64( uiA64 );
    exp   = expF128UI64( uiA64 );
    frac64 = fracF128UI64( uiA64 ) | (uiA0 != 0);
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    if ( exp == 0x7FFF ) {
        if ( frac64 ) {
            softfloat_f128UIToCommonNaN( uiA64, uiA0, &commonNaN );
            uiZ = softfloat_commonNaNToF16UI( &commonNaN );
        } else {
            uiZ = packToF16UI( sign, 0x1F, 0 );
        }
        goto uiZ;
    }
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    frac16 = softfloat_shortShiftRightJam64( frac64, 34 );
    if ( ! (exp | frac16) ) {
        uiZ = packToF16UI( sign, 0, 0 );
        goto uiZ;
    }
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    exp -= 0x3FF1;
    if ( sizeof (int_fast16_t) < sizeof (int_fast32_t) ) {
        if ( exp < -0x40 ) exp = -0x40;
    }
    return softfloat_roundPackToF16( sign, exp, frac16 | 0x4000 );
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
 uiZ:
    uZ.ui = uiZ;
    return uZ.f;
 
}

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